/*
 * Copyright (c) 2001-2004 Caucho Technology, Inc.  All rights reserved.
 *
 * The Apache Software License, Version 1.1
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Caucho Technology (http://www.caucho.com/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "Burlap", "Resin", and "Caucho" must not be used to
 *    endorse or promote products derived from this software without prior
 *    written permission. For written permission, please contact
 *    info@caucho.com.
 *
 * 5. Products derived from this software may not be called "Resin"
 *    nor may "Resin" appear in their names without prior written
 *    permission of Caucho Technology.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL CAUCHO TECHNOLOGY OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * @author Scott Ferguson
 */

package com.caucho.burlap.server;

import com.caucho.burlap.io.BurlapInput;
import com.caucho.burlap.io.BurlapOutput;
import com.caucho.services.server.AbstractSkeleton;
import com.caucho.services.server.ServiceContext;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * Proxy class for Burlap services.
 */
public class BurlapSkeleton extends AbstractSkeleton {
    private Object _service;

    /**
     * Create a new burlap skeleton.
     *
     * @param service the underlying service object.
     * @param apiClass the API interface
     */
    public BurlapSkeleton(Object service, Class apiClass)
    {
        super(apiClass);

        _service = service;
    }

    /**
     * Invoke the object with the request from the input stream.
     *
     * @param in the Burlap input stream
     * @param out the Burlap output stream
     */
    public void invoke(BurlapInput in, BurlapOutput out)
        throws Throwable
    {
        in.readCall();

        ServiceContext context = ServiceContext.getContext();

        String header;
        while ((header = in.readHeader()) != null) {
            Object value = in.readObject();

            context.addHeader(header, value);
        }

        String methodName = in.readMethod();
        Method method = getMethod(methodName);

        if (method != null) {
        }
        else if ("_burlap_getAttribute".equals(in.getMethod())) {
            String attrName = in.readString();
            in.completeCall();

            String value = null;

            if ("java.api.class".equals(attrName))
                value = getAPIClassName();
            else if ("java.home.class".equals(attrName))
                value = getHomeClassName();
            else if ("java.object.class".equals(attrName))
                value = getObjectClassName();

            out.startReply();

            out.writeObject(value);

            out.completeReply();
            return;
        }
        else if (method == null) {
            out.startReply();
            out.writeFault("NoSuchMethodException",
                "The service has no method named: " + in.getMethod(),
                null);
            out.completeReply();
            return;
        }

        Class[] args = method.getParameterTypes();
        Object[] values = new Object[args.length];

        for (int i = 0; i < args.length; i++)
            values[i] = in.readObject(args[i]);

        in.completeCall();

        Object result = null;

        try {
            result = method.invoke(_service, values);
        } catch (Throwable e) {
            if (e instanceof InvocationTargetException)
                e = ((InvocationTargetException) e).getTargetException();
            out.startReply();
            out.writeFault("ServiceException", e.getMessage(), e);
            out.completeReply();
            return;
        }

        out.startReply();

        out.writeObject(result);

        out.completeReply();
    }
}
